/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePartyInterface.h
Respond to a query joinability request. This reflects the current party's joinability state and can change from moment to moment, and therefore does not guarantee a successful join.
void RespondToQueryJoinability ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [FOnlinePartyId](API\Plugins\OnlineSubsystem\FOnlinePartyId) & PartyId, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & RecipientId, bool bCanJoin, int32 DeniedResultCode, [FOnlinePartyDataConstPtr](API\Plugins\OnlineSubsystem\Interfaces\FOnlinePartyDataConstPtr) PartyData )